Wifi connected televisions, for example, are often very poorly secured. Of course, it's not the end of the world if someone powers off your TV remotely or changes the channel.
But with internet connected devices becoming commonplace (the example they use on the page is a thermostat), security becomes more and more important. I would rather not have a hacker set my thermostat to 30C (85F) while I'm on a winter vacation. Or turn my stove on. Etc.
Can we step out of the technology bubble for a minute and agree that not everything needs to be connected and controllable?
It's not even that it needs to be controllable from my smartphone, but I think it'd be cool to put some cookie dough into the oven, tell the oven "cook these so that they are just slightly crisp on the outside but gooey on the inside", and the oven would have sensors and the temperature control mechanisms to do this, then notify me when it's time to take my cookies out.
It makes sense for such a device to be able to download updates (new functionality, recipes, retuning algorithms, etc) from the internet.
Under FDA/HACCP guidelines (that may someday morph into requirements), restaurants need to track and log things like operating temperatures, cycle times, and holding temperatures (setpoint and observed). Everything needs to be on record for a very long time in case of an outbreak.
There are some sites doing moderate IoT hosting and analysis, and some do whitelabel work which is nice. AWS will be another service to consider now.